The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 2026
Filed:
Sep. 14, 2022
Nippon Steel Corporation, Tokyo, JP;
Kazumasa Tsutsui, Tokyo, JP;
Hiroshi Shuto, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
This hot-rolled steel sheet has a predetermined chemical composition, has a microstructure including, by area %, martensite and tempered martensite of more than 92.0% and 100.0% or less in total, residual austenite of less than 3.0%, ferrite of less than 5.0%, and in which an entropy value obtained by analyzing an SEM image of the microstructure using a gray-level co-occurrence matrix method is 11.0 or more, an inverse difference normalized value is less than 1.020, a cluster shade value is −8.0×10to 8.0×10, and a standard deviation of an Mn concentration is 0.60 mass % or less, and has a tensile strength of 980 MPa or more.